Ancalagon
Dusty Dragon
2) Not Picking Any Useful Spells. Like, I get it, there are lots of "fun" spells so maybe you don't want to spend ALL your spell picks on the most devastating damage or crazy buff-combos. But, honestly, try to get at least an attack cantrip and some sort of nuclear option. You're not going to identify and rope trick enemies to death.[/INDENT]
I feel like some players, especially the ones that pick lousy spell lists, deliberately create crappy characters as a sort of passive-aggressive challenge to the game rules. "I should be allowed to play a cloistered pacifist! It makes me better than those violent min-maxers! It's role-playing!"
See that's where sacrificing "optimal" for "role-playing reasons" can get out of hand.... that's what I was trying to contrast with a reasonable sacrifice (going from 1d8 to 1d6, taking a "not the best" race for a class etc).